Internal combustion engine



- Filed June 19, 1929 Patentedv May 3 1932 7 umr so fSTATES PATENT FFlCIE ii I CABLTFLAKEBI, ou rnonrssnlvcr, -MISSOURI INTERNAL COMBUSTION; ENGINE Application filed June 19,

scribed and claimed 7 Y I V I I In the accompanying drawings, which i form part of this specification and wherein like symbols refer to likeparts wherever they occur, 7 I

Fig. 1 is a vertical central longitudinal section througha cylinder of an internal combustion engine-provided with a valve mechanism embodying my invention; and

a Fig. 2"is a horizontal cross-section on the line2i2 in Fig. Q1.

Referring to the accompanying drawings,

my invention is shown in connectionwith an internal combustion engine comprising ,a cylinder 1 having a piston 1a reciprocating therein, and diametricallyopposite intake and I exhaust ports 2 and 3, respectively, in communication with the clearance space or combustionchamber 4 located between the upper end of saidpiston and the head 5 of said cylinder. The piston 14; is connected to the crankshaft (not shown) of the engine by means of the usual piston'rod (not shown) usual exhaust and intake manifolds (not shown) of the engine.v As shown in the drawings, the head 5 of the cylinder is provided with an opening adapted to receive an igniting device or spark plug 6. The inlet and exhaust ports and 3 are opened and closed by means of valves disposed within the combustion chamber l of the cylinder land slidable longitudinally and arrangements of parts hereinafter deand the intake andexhaust ports 2 and 3 may be connected in any suitable manner with the thereof across the inner ends of said ports.

1929. Y Serial No. 372,057.

Said valves: preferably comprise diametri cally opposed duplicate concavo-convex blocksor members whose convex surfaces are'injc'ontact with the bore of the cylinder and have ,aradius of curvaturecorresponding .to the radius of curvature of said bore. The slidevalves are supported on the lower ends of valve stems 8 arranged for Hrotary and vertical sliding movement inbores provided therefor in diametrically opposed upstandlower end of each valve-stem is provided with an oifset oreccentric pin portion 10, which extends through an elongated vertical". opening ll'provided therefor in'the slide valve supported by said stem. The flower s end of theeccentric portion '10 of the valve stem 8 is provided with across-head 12 that extends on oppositesides of theslot 11in.

the slide block 7 and thus serves to hold said block on said stem. The cross-headof the valve stem is made smaller thanthe slot in the slide valve, whereby said valve may be i mounted on and removed from the valve stem when the latter is rotated to bring the crosshead thereof into register with said slot. The valve stem is provided adjacent to the upper face of the slide valvewith a collar portion ing bosses Qonthecylinder head5. The

13 forminga shoulder'or stop against which the upper face of said valve abuts. The stop collar 13 of the valvestem seats in a counter-bore 14; provided therefor in the head of a the cylinderand is provided with a'beveled surface 15 which, in the closed position of the valve,"seats against a beveledseat 16" in the upper end of said counterbore'and thus prevents leakage around the valve stem.

' Sleeved on the upstanding boss 9 for each 7 valvestem 8 is a coil spring 17 whoseelower end 18 is anchored in ahole provided; therefor in said head and whose upper end l9 is' seated ma hole provided therefor in a 001- lar 20 that is pinned or otherwise non-:rotatably secured to the: upper end of a valvestem. In assembling the parts, the spring 17 is twisted slightly in the direction in which it is wound,whereby'said :springacts after the manner ofa torsion or twist; spring and thus tends to rotate-the valve ste'm 8 in a direction which will force'the eccentric V pin thereof against the outer Wall of the elongated slot 11 in the slide valve 7 and thus maintain the convex face thereof in contact with the bore of the cylinder.

5 The spring supported valve stems 8 are a of roc k levers 21 that are mounted for vertical swinging-g movement on diametrically oppositeupstanding' lugs 22 on the cylinder head 5. The inner arms of the rock levers 21 are provided wi h r l rstfldflafllep fidr to bear against the upper ends of the respec- 5 by means of push rods 24 that engage their usualo rating/cams: (not sh wn). I

' "."Ihe erei before describedvalve mechanism hasfrnany advantages. Itissimplef in ,.ccnstru tion;has.few. p r sand is, ea i y 0perated, .It permits t valves vto be readily mountejd ;Q'I.1 .-.11 id removed from-the valve stemmed. it maintains. a, g s g t joint b tween, the, valves and the cylinder regardless :Qiwear. orvelfipansionor contraction of. the 25 'par sidueto, temperature ch ng Obviously, :the, hereinbefore described :val c ani m admit o nsid 'rab modification without'departing'from the in- 8 [the precise forms and arrangements jshown ins therdr w ng What, I. claim is:

LeA'valve assembly. for an internal comb sti n engi e, mprising, a valve hav ng a QPmiQgthe eima rotatable valve ste ,havinganseccen rie p ion freely movable :i the cpeni lg-in, said valve, a d a coi spring ISQ WedLQnWtsaidIv lv st and e ding to rotateh-theasameto cause the eccentric por- .t.ion, .he of-tc bear aga nst one Wall of said gpening to :press said. valve to. its seat;

Aava veiass mb yl for a internal comvbust-ionengine, comprising a slide valvepro- "side wi h a th e dl s opening, a rotatabl valvestemrhavingi aithread ess ccentric 1- tion; extending into the threadless opening in iusaid alve and a spring cooperating with saidyalve; stemtocpress the threadless eccen- KLIlQPQLtlOIlQbhflI'BOf againstone side of the hreadlessqpe letter to its seat rotary valve stem having, an eccentric porin the. ope ing insa e, [and a spring tending-t rotate said valve stem to press tlas-eccentric portion thereof against, one side 1 Of S 'd'openingin said valve to. hold the same v toitsseat, said valvev stem being provided ,unders nfac oil-sa d va and. a? sh ted to but against the upper suriac forced downwardly in alternation by means tive valve stems; and said levers are actuated outer arms and, in turn,- are actuatedby' the I "vention tand, I410, not swishto be limited to ning said valve to holdthe V kgm comprlsirig a slide valve hav- 1331- 11 opening ext n ng r rough,

ng through and. freelymovable 7 wi tl 'a cIs0ss=headQ adapted to-bear, against 7 4. A valve assembly for an internal combustion engine comprising a valve member when proper lyregistered therewith, and a coil spring cooperating with said valve stem and tending,,-to; rotate the same to press the eccentric portion thereof against one wall of saidelongated slot to thereby hold said valve to its seat and said cross-head in a position di osed crosswise of said elongated slot.

igned at StJLouis, Missouri, this 15day of J une, 1929.

CARL' 'FLAKER. 

